Skip to main content

What is active data guard and How to enable stanby database is in read-only mode (Active standby)

What is active data guard and How to enable stanby database is in read-only mode (Active standby)??

If trying open the standby database in read only mode will get the below error.

SQL> ALTER DATABASE OPEN READ ONLY;
ALTER DATABASE OPEN READ ONLY
*
ERROR at line 1:
ORA-10456: cannot open standby database; media recovery session may be in progress.

1. First we need turf off the log apply process on the standby database. Using the below.

DGMGRL> edit database <stdby_dbname> set state=apply-off;
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

SQL> ALTER DATABASE OPEN READ ONLY;
SQL>Select name, open_mode, switchover_status, database_role from v$database;

Start apply process using Broker (OR) Manually in standby database.

DGMGRL> edit database <stdby_dbname> set state=apply-on;
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;

To disable the active data guard, the steps are the same:

1. DGMGRL> edit database stdby set state=apply-off; (OR) 
   SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
2. Shutdown the stdby database;
3. Startup mount the stdby database
4. DGMGRL> edit database stdby set state=apply-on; (OR) 
    SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE USING CURRENT LOGFILE DISCONNECT;

Labels:

Comments

Post a Comment

Popular posts from this blog

CHANGING DBID FOR ORACLE DATABASE 11G

C:\Users\computer>sqlplus SQL*Plus: Release 11.1.0.7.0 - Production on Thu Sep 10 21:03:33 2013 Copyright (c) 1982, 2008, Oracle.  All rights reserved. Enter user-name: sys as sysdba Enter password: Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> select dbid from v$database;       DBID ---------- 2188161033 SQL> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options C:\Users\computer>nid DBNEWID: Release 11.1.0.7.0 - Production on Thu Sep 10 21:04:44 2013 Copyright (c) 1982, 2007, Oracle.  All rights reserved. Keyword     Description                    (Default) ---------------------------------------------------- TARGET ...
Post a Comment
Read more

Difference between AWR, ADDM and ASH reports

AWR: Automatic Workload Repository gathers, processes and maintains performance stats used for problem detection and self-tuning the databases. Different Components that uses AWR are: Automatic Database Diagnostic Monitor Undo Advisor SQL Tuning Advisor Segment Advisor Different types of AWR Reports for different purposes: For Single Instance Environment: @$ORACLE_HOME/rdbms/admin/awrrpt.sql For Oracle RAC Environment : @$ORACLE_HOME/rdbms/admin/awrgrpt.sql For a particular SQL Statement : @$ORACLE_HOME/rdbms/admin/awrsqrpt.sql For Comparing the reports : @$ORACLE_HOME/rdbms/admin/awrddrpt.sql ADDM: Automatic Database Diagnostic Monitoring Report analyzes the AWR data on a regular basis, to give you overview of the root cause of the problem which is affecting your database’s performance. It also provides suggestions or recommendations for rectifying any problem identified and lists the areas which are having no issues. ADDM recommends multiple solutions for the DBA to choose from which...
Post a Comment
Read more